Equal or not?

Algebra Level 2

Are the following functions the same?

y = x 1 x 2 1 y= \frac {x-1}{x^2-1} and y = 1 x + 1 y= \frac {1}{x+1}

No Yes

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2 solutions

Colin Carmody
Feb 2, 2016

Upon graphing the functions, they may appear the same. In fact they are exactly the same except for one value of x x . When x = 1 x=1 in the first equation, there is no solution (you can't divide by zero) but there is a value for x = 1 x=1 in the second equation. Both equations are similar, but it is a common misconception that they are the same thing.

Kay Xspre
Feb 2, 2016

Factorizing would cancel x 1 x-1 out, but since the first function is not defined with x 1 = 0 x-1 = 0 , then at x = 1 x = 1 , this function will be discontinued and hence is not the same function to the latter.

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